/Engine/Plugins/Media/MediaPlayerEditor/Source/MediaPlayerEditor/Public/AssetTools/MediaSourceActions.h
Returns additional tooltip information for the specified asset, if it has any (otherwise return the null widget)
virtual [FText](API\Runtime\Core\Internationalization\FText) GetAssetDescription ( const [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) & AssetData ) const